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Wednesday, April 15, 2020 | History

3 edition of Multiscale turbulence effects in supersonic jets exhausting into still air found in the catalog.

Multiscale turbulence effects in supersonic jets exhausting into still air

Khaled S. Abdol-Hamid

Multiscale turbulence effects in supersonic jets exhausting into still air

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  • 29 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Office, For sale by the National Technical Information Service] in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Supersonic planes.,
  • Jet planes -- Noise.

  • Edition Notes

    StatementKhaled S. Abdol-Hamid, Richard G. Wilmoth.
    SeriesNASA technical paper -- 2707.
    ContributionsWilmoth, Richard G., United States. National Aeronautics and Space Administration. Scientific and Technical Information Office.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14663387M

    Full text of "DTIC ADA A Summary/Overview of Ejector Augmentor Theory and Performance. Volume 2. Bibliography" See other formats


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Multiscale turbulence effects in supersonic jets exhausting into still air by Khaled S. Abdol-Hamid Download PDF EPUB FB2

A modified version of the multiscale turbulence model of Hanjalic has been applied to the problem of supersonic jets exhausting into still air. In particular, the probleni of shock-cell decay through turbulent interaction with the mixing layer has been studied for both mildly interacting and strongly resonant jet :// Multiscale turbulence effects in supersonic jets exhausting into still air Article (PDF Available) August with 23 Reads How we measure 'reads' A modified version of the multiscale turbulence model of Hanjalic has been applied to the problem of supersonic jets exhausting into still air.

In particular, the problem of shock-cell decay through turbulent interaction with the mixing layer has been studied for both mildly interacting and strongly resonant jet A. Multiscale turbulence effects in supersonic jets exhausting into still air.

Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, (OCoLC) Material Type: Get this from a library.

Multiscale turbulence effects in supersonic jets exhausting into still air. [Khaled S Abdol-Hamid; Richard G Wilmoth; United States. National Aeronautics and Space Administration.

Scientific and Technical Information Office.] A modified version of the multiscale turbulence model of Hanjalic has been applied to the problem of supersonic jets exhausting into still air. In particular, the problem of shock-cell decay through turbulent interaction with the mixing layer has been studied for both mildly interacting and strongly resonant jet conditions.

The modified Hanjalic model takes into account the nonequilibrium A/abstract. Multiscale turbulence effects in supersonic jets exhausting into still air / By Khaled S. (Khaled Sayed) Abdol-Hamid, Richard G. Wilmoth and Langley Research Center. Abstract PDF | On Jun 8,Khaled S.

Abdol-Hamid and others published Multiscale turbulence effects in underexpanded supersonic jets | Find, read and cite all the research you need on ResearchGate Air turbulence created a fan generated noise within a model.

Multiscale turbulence effects in supersonic jets exhausting into still air has been applied to the problem of supersonic jets Supersonic diffusers. See also what's at your library, or elsewhere. Broader term: Aerodynamics, Supersonic; Filed under: Supersonic diffusers Performance of a short annular dump diffuser using suction-stabilized vortices at inlet Mach numbers to / (Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield,   Large-eddy simulations of supersonic turbulent jets are performed for Reynolds numbers of R e effects of Reynolds numbers and the Mach number subgrid terms in large-eddy simulations are modeled using a combination of the dynamic Smagorinsky (“ General Circulation Experiments with the Primitive :// A multiple-scales model of the shock-cell structure of imperfectly expanded supersonic jets - Volume - Christopher K.

Tam, Jay A. Jackson, J. Seiner A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the :// An explicit cell-centered finite volume solver coupled to a k − ε turbulence model corrected for structural compressibility fails to satisfactorily predict the behavior of under-expanded supersonic jets exhausting into still air, because the model does not properly account for the turbulence/shock wave interaction.

Two approaches are examined: imposing a realizability constraint and taking   The aircraft encountered severe wake turbulence from taking off too soon behind a ; between the roiling exhaust air and the pilot's attempt to fight it with rudder control, the entire tail and both engines snapped clean off the aircraft and sent all of it into Queens, killing ://   A special fuel that was stable at high temperatures was developed for the Blackbird.

According to the SR manual, the fuel was used both as energy for the engine and also as engine hydraulic fluid - fluid used to power certain engine components. When the airplane was traveling supersonically, the fuel was also used as part of a heat sink.A heat sink is a device that uses a fluid to Computational approaches are being developed to study a range of problems in aeroacoustics.

These aeroacoustic problems may be classified based on the physical processes responsible for the sound radiation, and range from linear problems of radiation, refraction, and scattering in known base flows or by solid bodies, to sound generation by :// The behavior of compressible turbulent jets issuing in still air in the absence of shock waves has been investigated at three different subsonic Mach numbers,and Engineering Turbulence Modelling and Experiments The flow fields investigated are those of a single axi-symmetric circular jet issuing into still fluid and two similar jets issuing into still fluid but then impinging upon one another at a short distance from the nozzle exits.

Data are presented for overall profile shapes, in terms of pixel The system effectively "tricks" the air into thinking it is in an infinite flowfield, rather than confined by the walls of the tunnel. This idea was developed by Sears in the s.

75th Anniversary of the Graduate Aeronautical Laboratories celebrated at Caltech. Ares J. Rosakis becomes the fifth Director of   Supersonic impinging jets are an important problem for short-takeoff and vertical-landing military aircraft.

High-speed jet impingement on landing surface leads to many adverse effects such as high levels of unsteady pressure loads on landing surface and nearby structures, significantly higher noise levels than conventional takeoff aircraft, aircraft lift loss during hover, and landing-surface Book — p.: ill.

; 26 cm. Summary Some experimental and theoretical studies have been made of axisymmetric free jets exhausting from sonic and supersonic nozzles into still air and into supersonic streams with a view toward problems associated with propulsive jets ?q="NASA+technical+report+;"&search_field.

ACDAircraft Configuration Design Studies - Flying/Blended and Truss-Braced Wings • Monday, 6 January • hrs   The fan in the FBJ is a compressor (not just a fan) that raises the pressure of air going into the combustion unit so the expanding gases must go out the exhaust nozzle.

Since the EDF requires a greater mass flow of air to acheive a given amount of thrust, the profile drag of the EDF model is higher due to the larger inlet area and due to the ?.

An experimental and numerical study of the turbulent flow structure of three rectangular jet flows was conducted. Measurements were performed using a hot-wire anemometer having an x-type tions were obtained using a finite-difference based computer program that solves the parabolic governing equations of the mean flow along with the turbulence kinetic energy and its In addition, the calculations of the flat supersonic isobaric jet issuing into quiescent air (D= m, M jet =, T 0jet =T out = K, p=1 atm) have been performed.

To take into account the turbulence compressibility effects, a correction that was described in and based on Dash et al. work has been :// Development of the Nano Hummingbird: A Tailless Flapping Wing Micro Air Vehicle (English) Keennon, M.

/ Klingebiel, K. / Won, H. / Andriukov, A. / American Institute of Aeronautics and Astronautics:CN This study presents a semi analytical solution for the transient weakly underexpanded jet.

Different polytropic processes are compared with available experimental data in the literature to assess the best process for steady and transient weakly underexpanded ://   @article{osti_, title = {"Postage-Stamp PIV:" Small Velocity Fields at kHz for Turbulence Spectra Measurements}, author = {Beresh, Steven J.

and Henfling, John F. and Spillers, Russell Wayne}, abstractNote = {Time-resolved particle image velocimetry recently has been demonstrated in high-speed flows using a pulse-burst laser at repetition rates reaching 50 :// Engineering Turbulence Modelling and Experiments 4 Results are presented from a numerical investigation into the effects of a free surface on the profiles of a circular turbulent jet issuing parallel to, and just below, a liquid-gas boundary.

Turbulence is still one of the key issues in tackling engineering flow problems. As powerful   Great efforts have been dedicated during the last decades to the research and development of hypersonic aircrafts that can fly at several times the speed of sound.

These aerospace vehicles have revolutionary applications in national security as advanced hypersonic weapons, in space exploration as reusable stages for access to low Earth orbit, and in commercial aviation as fast long-range Literatur und Quellen. Authors; Authors and affiliations On the Structure of Jets from Highly Underexpanded Nozzles into Still Air.

of the Aero/Space Sciences, 16, pp. 16 - 24, Jan. Characteristics of Free Supersonic Jets Exhausting into Quiescent Air.

Jet Propulsion, Jan. pp. 13 - 15, Google Scholar // Moustafa   Simulations of an ideally expanded supersonic jet for two operating temperatures are conducted with a low aspect ratio of two rectangular nozzle, and an equivalent diameter circular nozzle of the same design Mach number.

The emphasis is on accurately resolving the near-field data, capturing the far-field acoustics, and examining the flow asymmetry of the rectangular :// In thermal spraying processes, molten, semi-molten, or solid particles, which are sufficiently fast in a stream of gas, are deposited on a substrate.

These particles can plastically deform while impacting on the substrate, which results in the formation of well-adhered and dense coatings. Clearly, particles in flight conditions, such as velocity, trajectory, temperature, and melting state   Navier–Stokes solvers in European aircraft design(欧洲飞行器设计设计中N-S方程的求解)_交通运输_工程科技_专业资料 人阅读|40次下载 Navier–Stokes solvers in European aircraft design(欧洲飞行器设计设计中N-S方程的求解)_交通运输_工程科技 Full text of "Fluid amplifier state of the ii- bibliography" See other formats I /Jy Z t (PAOeS (CO ^ ^^ (NASA CR OR TkiX OR AD NUMBER) (CATEGORY) (CODE) NASA CR FLUID AMPLIFIER STATE OF THE ART VOLUME II - BIBLIOGRAPHY Distribution of this report is provided in the interest of information exchange and should not be construed as endorsement by NASA of the material :// 2 days ago  A rocket engine uses stored rocket propellants as reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas.

Rocket engines are reaction engines, producing thrust by ejecting mass rearward, in accordance with Newton's third rocket engines use the combustion of reactive chemicals to supply the necessary energy, but non-combusting forms such as Guangzhe Yu, Jiannan Dong, Lynn M. Foster, Athena E. Metaxas, Thomas M.

Truskett and Keith P. Johnston, Breakup of Oil Jets into Droplets in Seawater with Environmentally Benign Nanoparticle and Surfactant Dispersants, Industrial & Engineering Chemistry Research, 54, 16, (), () Using data from a large-scale three-dimensional simulation of supersonic isothermal turbulence, we have tested the validity of an exact flux relation derived analytically from the Navier-Stokes equation by Falkovich, Fouxon & Oz (J.

Fluid Mech., vol.p. The behavior of microvortex generators in supersonic flow has been studied at the Aerodynamics Research Center as part of a research grant from the Air Force Office of Strategic Research.

In addition to more commonly used flow measurement techniques, a method was developed to inject fluorescent vapor into the supersonic wind tunnel around the. ElectraTone Guitar Effects Clint Taylor Committed To The G Chess Study Podcast Curds and Why Dj AleX Rio Alg2 Ch 2 Linear Functions EPHS.

Featured software All software latest This Just In Old School Emulation MS-DOS Games Historical Software Classic PC Games Software Library. Internet Arcade. Besides a philosophical interest in the true nature of turbulence models, the SAS and turbulence-resolving RANS work is motivated by the disruptive effects of in  › 百度文库 › 互联网.

Everything seemed to be going smoothly, or so it seemed, when there was a warning that the number 2 secondary nozzle ‘buckets’ had travelled towards reverse (the blue transit light was flashing) although the indicator on the E/O’s panel still apparently showed the nozzle at the correct zero degree position for supersonic ://